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author | Jens Axboe <axboe@kernel.dk> | 2013-10-29 18:11:47 (GMT) |
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committer | Jens Axboe <axboe@kernel.dk> | 2013-10-29 18:11:47 (GMT) |
commit | e7e245000110a7794de8f925b9edc06a9c852f80 (patch) | |
tree | c774b4b9e7d7cdb59f3b4a237fd12c4e5eb8bc60 /drivers/scsi/sg.c | |
parent | 92f399c72af2d8cbb9d4f60e11d0d67ca738147f (diff) | |
download | linux-fsl-qoriq-e7e245000110a7794de8f925b9edc06a9c852f80.tar.xz |
blk-mq: don't disallow request merges for req->special being set
For blk-mq, if a driver has requested per-request payload data
to carry command structures, they are stuffed into req->special.
For an old style request based driver, req->special is used
for the same purpose but indicates that a per-driver request
structure has been prepared for the request already. So for the
old style driver, we do not merge such requests.
As most/all blk-mq drivers will use the payload feature, and
since we have no problem merging on these, make this check
dependent on whether it's a blk-mq enabled driver or not.
Reported-by: Shaohua Li <shli@fusionio.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/scsi/sg.c')
0 files changed, 0 insertions, 0 deletions